(57) A chip transformer comprising a substrate carrying a plurality of ferrite sheets
(1 to 8), at least some of the ferrite sheets (1, 2, 6, 7, and 8) being provided with
one or several conductor path segments (1b, 2b, 4b, 6b, 7b, 8b), where the conductor path segment(s( on each ferrite sheet is/are optionally connected
to one or more conductor path segments on one or more of the other ferrite sheets
to form a primary winding and a secondary winding of the transformer. The ferrite
material is composed as follows
Li0,5(1+t-z-c)Znz, Mnm, Tit, Coc, Fe(1-0,2z-0,6t-0,4m-0,2c-ε)
where 0≦t≦0,2; 0,2≦z≦0,5; 0,2≦m≦0,4; 0,02≦c≦0;05; and ε is of the magnitude 0,06,
Bi₂O₃ also being added. The latter material discloses a specific resistivity which
is so high that additional isolating layers between the windings can be avoided. The
omission of the isolating layers ensures a high degree of freedom as to positioning
of the individual windings relative to one another.
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